Unregulated Voltage

Discussion in 'Technical Help' started by Steven Iley, Jan 29, 2020.

  1. Steven Iley

    Steven Iley New Member

    Oct 22, 2019
    3
    3
    Uk
    #1 Steven Iley, Jan 29, 2020
    Hi everyone, after an hours ride out on my 09 speed triple I called round a mates house for 20 mins. when trying to re start the bike it turned the engine briefly and then stopped so I turned the key off and on and it started. Felt like a failing battery (seems quite common) once home I connected the optimiser, I should of measured the battery volts but the cold had set in my bones. Anyway next morning battery still wasn’t fully charged and bike wouldn’t start so I changed the optimiser to full charging mode which soon sorted the battery. anyhow I Removed the battery from the charger and left off for a few days to see if a there was any volt loss..the battery remained charged @ 13.5 and gave a healthy 14.5v when running. So ... I thought I’d better have a poke around and tested the stator. 0.5 ohms between pins and open circuit when tested to ground the only test which didn’t correspond with the Haynes manual was the a/c voltage test which said it should be 35-40v @4-5k rpm but I am getting over 80v. Anybody else had these readings as on other bikes Ive had they would be considered normal but they are double what the book recommends.
    Any help would be appreciated.
     
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  2. tim8061

    tim8061 Member

    Dec 28, 2019
    49
    18
    Gloucester
    #2 tim8061, Jan 30, 2020
    Sounds all OK - exact a.c. voltage is not important and can vary from bike to bike. Important thing is they all meter the same for resistance and volts when running. The reg/rect will sort it out and sounds like that is giving a good output. I think the Haynes manual is a bit pessimistic TBH.
     
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  3. capt

    capt Elite Member

    May 8, 2016
    3,051
    750
    western Australia
    #3 capt, Jan 30, 2020
    As Tim said above , so long as three Reading's are good , your charging system is OK !
    1 windings on alternator don't go to ground (no short)
    2 ac volts when running at speed (any speed so long as same for each test) is the same give or take a volt or two , across each phase !
    3 output Volt's to battery through regulator/rectifier are stable and above 13•5 up to 14•7 v.

    All is OK !
     
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  4. joe mc donald

    joe mc donald Joe
    Subscriber

    Dec 26, 2014
    15,601
    1,000
    slough / burnham
    #4 joe mc donald, Jan 30, 2020
    Steven lley
    Yes may gust have been a blip in the battery. Make sure the connections are all clean and greased. Battery may just be starting to fail if it has bee a long term fitment. Mind you my battery in my 865 bonnie has been going strong for 10 years now. Bet you know what will happen me now I have said that.
    Regards & Ride Safe.
    Joe.
     
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  5. Foxy1

    Foxy1 Crème de la Crème

    Aug 31, 2018
    1,251
    1,000
    Sheffield
    #5 Foxy1, Feb 5, 2020
    It's t'same problem a few people on here have had, including misen. I find it's when t'engines warm. If I call for petrol ont way to work, 1 mile, its fine. If I call ont way home, 10 miles, it struggles to start, wit symptoms like a flat battery. I lerrit stand for 10-15 mins and it fires up as though thiz never been owt up wiyit!!
     
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  6. Steven Iley

    Steven Iley New Member

    Oct 22, 2019
    3
    3
    Uk
    #6 Steven Iley, Feb 5, 2020
    Haha fantastic! Thanks gents.
     
  7. Foxy1

    Foxy1 Crème de la Crème

    Aug 31, 2018
    1,251
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    Sheffield
    #7 Foxy1, Feb 6, 2020
    :joy::joy::joy::joy: Brilliant mate. Pissed misen!!
     
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